To be fair, you can replace vdevs with same-sized or larger vdevs online.
The issue is that you cannot replace with smaller vdevs nor can you
eliminate vdevs.  In other words, I can migrate data around without
downtime, I just can't shrink or eliminate vdevs without send/recv.
This is where the philosophical disconnect lies.  Everytime we descend
into this rathole, we stir up more confusion :-(

We did just this to move off RAID-5 LUNs that were the vdevs for a
pool, to RAID-10 LUNs. Worked very well, and as Richard said was done
all on-line. Doesn't really address the shrinking issue though. :-)

Best Regards,
Jason
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